pearson



(N Model.)

G.P.PEARSON. 'STREET- CARv JAGK.

No; 502,200. Patented July 25, 1893;

Fay I =Rl-ai l' ixiiwi'zh GEORGE F. PEARSONnQF IiOWEL s FR'EET-cARli'hCK;

'ntssnmslm SPECIFICATION forming part of Letters Patent No. 502,200,dated July 25, 1893.

Application filed October 31, 1892.

To all whom it may concern:

Be it known that I, GEORGE F. PEARSON, a citizen of the United States,residing at Lowell, in the county of Middlesex and State ofMassachusetts, have invented certain new and usefullmprovements inStreet-Oar Jacks, of which the following is a specification.

My invention relates to devices adapted to lift objects and move themlaterally; and the principal object of the invention is to provideconvenient means for replacing derailed street cars.

l The device, stated generally, consists of a ack-screw having both itsends hinged or pivoted to plates or other devices one of which may bemade to serve as the base and the other as the head, whereby a bodysupported by the jack may be first lifted and then moved in a curvedcourse laterally and downwardlythe head and base of the jack beingadapted to maintain their respective positions in parallel planes. Suchdevice is particularly well adapted for use in placing on a trackderailed street cars, for with it the car can be first lifted as much asmay be required and then moved laterally on the jack as a pivot to itsproper position on the rails. By the use of such device a derailed carcan be quickly replaced and the delays and annoyances occasloned by theordinary methods of replacing a car may be avoided.

My improvements are illustrated in the accompanying drawings, in which-Figure 1 is an elevation of the device in position to lift a car orother object; Fig. 2 a similar elevation showing the device in inclinedposition, as it would appear in moving the car laterally; Fig. 3 anenlarged view of an end portion of the device; Fig. 4 a sectional viewof the same, on the line 09-50 of Fig. 3; and Fig. 5 a similar sectionalview on a plane at right angles to that of the line xoc.

In the drawings 1 designates a portion of a car or other body to bemoved and the line 2 the ground or base upon which the jack is made torest. The jack consists of an upper portion 3 and a lower portion 4:,each having screw-threaded sockets to receive the double, or oppositelythreaded screw 5. At its middle the screw is fast to a head or nut 6,which when turned, serves to rotate the screw and thus move it in thesame direction in both the upper and lower sockets, and thus cause thetwo members 3 and at to approach or recede simultaneously as the head isturned in one direction or the other. A single screw instead of thedouble might be used, but the latteris preferable as it effects a savingof time. The preferred means provided for turning the head is a rod orlever 7 inserted in a hole extending through the head, but a spanner orother device may be used in place of the rod 7, or the head may beoperated by pawl and ratchet or other means if desired. The outer endsof the jack members 3 and 4 are suitably rounded, as shown at 8, andprovided with slots 9 which have their inner walls,10, curved. In theseslots are fitted tongues 11 having rounded ends that bear againstthecurved ends of the slots and are kept in place by pins 12 extendingthrough the side walls of the slots. The pins are not intended tosupport the weight to be lifted and moved, but merely to hold the partstogether and adapt them to turn on the pins as pivots. is rigidlysecured to a plate'or other suitable device 13. Both halves of the jackmay be Each tongue 11 of exactly similar construction so that either.top in place against the car bottom, so that the movement of the carwill be an are from a higher to a lower position as indicated by thedotted lines 2 in Figs. 1 and 2. The car may be thus lifted sufficientlyto cause the wheel flanges to clear the rails and then be moved over andmade to descend upon the rails.

Having described my invention, what I claim is 1. A screw-jack, having ascrew turning in internally and oppositely threaded upper and lowermembers having slotted curved outer ends, a base and a head eachprovided with a tongue for entering the appropriate endhead each havinga tongue pivoted in an end- 10 slot in its appropriate member, wherebyobjects may be lifted and the jack swung lat erally in a vertical planeonly, substantially as set forth.

GEORGE F. PEARSON. Witnesses:

CHAS. E. BOND, R. BLUME.

